Class<SpecialNamedThing> specialItemClass = SpecialNamedThing

    def setup() {
        registry.register(
            ModelRegistrations.bridgedInstance(
                ModelReference.of(path, new ModelType<NamedEntityInstantiator<NamedThing>>() {}),
                { name, type -> DirectInstantiator.instantiate(type, name) } as NamedEntityInstantiator
            )
                .descriptor(path.toString())

        when:
        registry.configure(targetRole, ModelReference.of("thing", Bean), Actions.doNothing())

        then:
        def ex = thrown IllegalStateException

        ModelPath binaryPath = backingNode.getPath().child(name);
        backingNode.applyToLink(ModelActionRole.Defaults, DirectNodeNoInputsModelAction.of(
            ModelReference.of(binaryPath, NativeBinarySpec.class),
            new SimpleModelRuleDescriptor("initialize binary " + binaryPath),
            new BiAction<MutableModelNode, NativeBinarySpec>() {
                @Override

        ModelTypes.modelMap(itemType)
    }

    void mutate(@DelegatesTo(ModelMap) Closure<?> action) {
        registry.mutate(ModelReference.of(path, modelMapType), ClosureBackedAction.of(action))
    }

    void mutateWithoutDelegation(Action<ModelMap<T>> action) {
        registry.mutate(ModelReference.of(path, modelMapType), action)
    }

    void realize() {
        registry.realizeNode(path)
    }

            .unmanagedInstance(ModelReference.of(path, type), factory)
            .descriptor(instanceDescriptorFor(path))
            .hidden(true)
            .build());
    }

    private <T> void registerServiceOn(ModelRegistry modelRegistry, String path, ModelType<T> type, T instance, String descriptor) {
        modelRegistry.register(ModelRegistrations.serviceInstance(ModelReference.of(path, type), instance)

Class <org.gradle.model.internal.core.ModelReference> is not annotated (directly or via its package) with @org.gradle.api.NonNullApi in (ModelReference.java:0)
Class <org.gradle.model.internal.core.ModelRegistration> is not annotated (directly or via its package) with @org.gradle.api.NonNullApi in (ModelRegistration.java:0)